Quartus II Settings File Reference Manual - Altera

Chapter 4: Analysis & Synthesis Assignments 4–25
AUTO_GLOBAL_CLOCK_MAX
AUTO_GLOBAL_CLOCK_MAX
Type
Allows the Compiler to choose the signal that feeds the most clock inputs to flipflops
as a global clock signal that is made available throughout the device on the global
routing paths. If you want to prevent the Compiler from automatically selecting a
particular signal as global clock, set the Global Signal option to Off on that signal.
This option can be used as a project-wide option, or assigned to a design entity.
This option is turned on by default.
Boolean
Device Support
This setting can be used in projects targeting the following device families:
■ MAX3000A
■ MAX7000A
■ MAX7000AE
■ MAX7000B
■ MAX7000S
Syntax
set_global_assignment -name AUTO_GLOBAL_CLOCK_MAX
set_global_assignment -name AUTO_GLOBAL_CLOCK_MAX -entity
set_instance_assignment -name AUTO_GLOBAL_CLOCK_MAX -to -entity
Example
set_global_assignment -name auto_global_clock_max off
set_instance_assignment -name auto_global_clock_max off -to foo
Default Value
On
Old Names
This variable also has the following name(s) in some earlier versions of the Quartus II
software:
Auto Global Clock -- MAX 7000B/7000AE/3000A/7000S/7000A
June 2012 Altera Corporation Quartus Settings File
Reference Manual